<template>
  <div class="course">
    <Header></Header>
    <div class="main">
      <!-- 筛选条件 -->
      <div class="condition">
        <ul class="cate-list">
          <li class="title">课程分类:</li>
          <li :class="category===0?'this':''" @click="catagory_vary()">全部</li>
          <li :class="category===category_values.id?'this':''" v-for="(category_values, index) in category_data" :key="category_values.id" @click="catagory_vary(category_values.id)" @change="get_courses(category_values.id)">{{category_values.name}}</li>
        </ul> 

        <div class="ordering">
          <ul>
            <li class="title">筛&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;选: </li>
            <li class="default this">默认</li>
            <li class="hot this">人气</li>
            <li class="price this">价格</li>
          </ul>
          <p class="condition-result">共21个课程</p>
        </div>

      </div>
      <!-- 课程列表 -->
      <div class="course-list">
        <div class="course-item" v-for="(course_values,index) in course_data" :key="course_values.id">
          <div class="course-image">
            <img :src="course_values.course_img" alt="">
          </div>
          <div class="course-info">
            <h3><router-link :to="'/coursedetail/' + course_values.id + '/'">{{course_values.name}}</router-link> <span><img src="@/assets/touxiang.png" alt="">{{course_values.students}}人已加入学习</span></h3>
            <p class="teather-info">{{course_values.teacher.signature}} {{course_values.teacher.name}} {{course_values.teacher.title}} <span>共{{course_values.lessons}}课时/{{course_values.lessons===course_values.pub_lessons?'更新完成':`已更新${course_values.pub_lessons}课时`}}</span></p>
            <ul class="lesson-list" v-for="(course_chapters,index) in course_values.get_lessons" :key="course_chapters.id" >
              <li><span class="lesson-title">0{{course_chapters.chapter}} | 第{{course_chapters.lesson}}节：{{course_chapters.name}}</span> <span class="free" v-if="course_chapters.free_trail">免费</span></li>
            </ul>
            <div class="pay-box">
              <span class="discount-type">限时免费</span>
              <span class="discount-price">￥{{course_values.real_price}}元</span>
              <span class="original-price">原价：{{course_values.price}}元</span>
              <span class="buy-now">立即购买</span>
            </div>
          </div>
        </div>
      </div>
       <div class="block" style="text-align:center">
          <el-pagination
            @current-change="handleCurrentChange"

            :page-size="5"
            layout="total, prev, pager, next"
            :total="this.course_total">
          </el-pagination>
       </div> 
      </div>
    <Footer></Footer>
  </div>
</template>

<script>
  import Header from "@/components/common/Header.vue"
  import Footer from "@/components/common/Footer.vue"
  export default {
      name: "Course",
      data(){
        return{
          category:0,
          category_data:'',
          course_data:'',
          current_page:1,
          course_total:0,
        }
      },
      components:{
        Header,
        Footer,
      },
      methods:{
        get_category(){
          this.$axios.get(`${this.$settings.Host}/course/category`)
          .then(res=>{
            this.category_data=res.data;
          })
          .catch(error=>{})
        },
        catagory_vary(categoryid=0){
          this.category=categoryid;
          this.current_page = 1;
          this.get_course(categoryid)
        },
        get_course(course_category=0,page=1){
          let params = {};
          params['course_category'] = course_category;
          params['page'] = page;
          if(course_category===0){
            delete params['course_category'];
            this.$axios.get(`${this.$settings.Host}/course/course`, {params:params})
            .then(res=>{
            this.course_data=res.data.results;
            this.course_total = res.data.count;
            })
            .catch(error=>{})
          }else{
            this.$axios.get(`${this.$settings.Host}/course/course`, {params:params})
            .then(res=>{
            this.course_data=res.data.results;
            this.course_total = res.data.count;
            })
            .catch(error=>{})
          }
          
          
        },
        handleCurrentChange(val){
          this.current_page = val;
          this.get_course(this.category,this.current_page)
        },
      },
      created(){
        this.get_category();
        this.get_course();
      },
  }
</script>



<style scoped>
  .course{
    background: #f6f6f6;
  }
  .course .main{
    width: 1100px;
    margin: 35px auto 0;
  }
  .course .condition{
    margin-bottom: 35px;
    padding: 25px 30px 25px 20px;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .course .cate-list{
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
    padding-bottom: 18px;
    margin-bottom: 17px;
  }
  .course .cate-list::after{
    content:"";
    display: block;
    clear: both;
  }
  .course .cate-list li{
    float: left;
    font-size: 16px;
    padding: 6px 15px;
    line-height: 16px;
    margin-left: 14px;
    position: relative;
    transition: all .3s ease;
    cursor: pointer;
    color: #4a4a4a;
    border: 1px solid transparent; /* transparent 透明 */
  }
  .course .cate-list .title{
    color: #888;
    margin-left: 0;
    letter-spacing: .36px;
    padding: 0;
    line-height: 28px;
  }
  .course .cate-list .this{
    color: #ffc210;
    border: 1px solid #ffc210!important;
    border-radius: 30px;
  }
  .course .ordering::after{
    content:"";
    display: block;
    clear: both;
  }
  .course .ordering ul{
    float: left;
  }
  .course .ordering ul::after{
    content:"";
    display: block;
    clear: both;
  }
  .course .ordering .condition-result{
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    line-height: 28px;
  }
  .course .ordering ul li{
    float: left;
    padding: 6px 15px;
    line-height: 16px;
    margin-left: 14px;
    position: relative;
    transition: all .3s ease;
    cursor: pointer;
    color: #4a4a4a;
  }
  .course .ordering .title{
    font-size: 16px;
    color: #888;
    letter-spacing: .36px;
    margin-left: 0;
    padding:0;
    line-height: 28px;
  }
  .course .ordering .this{
    color: #ffc210;
  }
  .course .ordering .price{
    position: relative;
  }
  .course .ordering .price::before,
  .course .ordering .price::after{
    cursor: pointer;
    content:"";
    display: block;
    width: 0px;
    height: 0px;
    border: 5px solid transparent;
    position: absolute;
    right: 0;
  }
  .course .ordering .price::before{
    border-bottom: 5px solid #aaa;
    margin-bottom: 2px;
    top: 2px;
  }
  .course .ordering .price::after{
    border-top: 5px solid #aaa;
    bottom: 2px;
  }
  .course .course-item:hover{
    box-shadow: 4px 6px 16px rgba(0,0,0,.5);
  }
  .course .course-item{
    width: 1050px;
    background: #fff;
    padding: 20px 30px 20px 20px;
    margin-bottom: 35px;
    border-radius: 2px;
    cursor: pointer;
    box-shadow: 2px 3px 16px rgba(0,0,0,.1);
    /* css3.0 过渡动画 hover 事件操作 */
    transition: all .2s ease;
  }
  .course .course-item::after{
    content:"";
    display: block;
    clear: both;
  }
  /* 顶级元素 父级元素  当前元素{} */
  .course .course-item .course-image{
    float: left;
    width: 423px;
    height: 210px;
    margin-right: 30px;
  }
  .course .course-item .course-image img{
    width: 100%;
  }
  .course .course-item .course-info{
    float: left;
    width: 596px;
  }
  .course-item .course-info h3 {
    font-size: 26px;
    color: #333;
    font-weight: normal;
    margin-bottom: 8px;
  }
  .course-item .course-info h3 span{
    font-size: 14px;
    color: #9b9b9b;
    float: right;
    margin-top: 14px;
  }
  .course-item .course-info h3 span img{
      width: 11px;
      height: auto;
      margin-right: 7px;
  }
  .course-item .course-info .teather-info{
      font-size: 14px;
      color: #9b9b9b;
      margin-bottom: 14px;
      padding-bottom: 14px;
      border-bottom: 1px solid #333;
      border-bottom-color: rgba(51,51,51,.05);
  }
  .course-item .course-info .teather-info span{
      float: right;
  }
  .course-item .lesson-list::after{
      content:"";
      display: block;
      clear: both;
  }
  .course-item .lesson-list li {
    float: left;
    width: 44%;
    font-size: 14px;
    color: #666;
    padding-left: 22px;
    /* background: url("路径") 是否平铺 x轴位置 y轴位置 */

    margin-bottom: 15px;
  }
  .course-item .lesson-list li .lesson-title{
      /* 以下3句，文本内容过多，会自动隐藏，并显示省略符号 */
      text-overflow: ellipsis;
      overflow: hidden;
      white-space: nowrap;
      display:inline-block;
      max-width: 200px;
  }
  .course-item .lesson-list li:hover{

      color: #ffc210;
  }
  .course-item .lesson-list li .free{
      width: 34px;
      height: 20px;
      color: #fd7b4d;
      vertical-align: super;
      margin-left: 10px;
      border: 1px solid #fd7b4d;
      border-radius: 2px;
      text-align: center;
      font-size: 13px;
      white-space: nowrap;
  }
  .course-item .lesson-list li:hover .free{
      color: #ffc210;
      border-color: #ffc210;
  }
  .course-item .pay-box::after{
    content:"";
    display: block;
    clear: both;
  }
  .course-item .pay-box .discount-type{
    padding: 6px 10px;
    font-size: 16px;
    color: #fff;
    text-align: center;
    margin-right: 8px;
    background: #fa6240;
    border: 1px solid #fa6240;
    border-radius: 10px 0 10px 0;
    float: left;
  }
  .course-item .pay-box .discount-price{
    font-size: 24px;
    color: #fa6240;
    float: left;
  }
  .course-item .pay-box .original-price{
    text-decoration: line-through;
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    float: left;
    margin-top: 10px;
  }
  .course-item .pay-box .buy-now{
    width: 120px;
    height: 38px;
    background: transparent;
    color: #fa6240;
    font-size: 16px;
    border: 1px solid #fd7b4d;
    border-radius: 3px;
    transition: all .2s ease-in-out;
    float: right;
    text-align: center;
    line-height: 38px;
  }
  .course-item .pay-box .buy-now:hover{
    color: #fff;
    background: #ffc210;
    border: 1px solid #ffc210;
  }
</style>
